/Engine/Source/Editor/LevelEditor/Public/ILevelEditor.h
Called to process a key down event in a viewport when in immersive mode
[FReply](API\Runtime\SlateCore\Input\FReply) OnKeyDownInViewport ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const [FKeyEvent](API\Runtime\SlateCore\Input\FKeyEvent) & InKeyEvent )